52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
|
package eventloop
|
||
|
|
|
||
|
|
import (
|
||
|
|
"runtime"
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Event is receiving notification from loop with Handle() call.
|
||
|
|
type Event interface {
|
||
|
|
Handle()
|
||
|
|
}
|
||
|
|
|
||
|
|
// EventLoop is interface for event loops.
|
||
|
|
// Start starting events processing
|
||
|
|
// Send adding event to loop
|
||
|
|
type EventLoop interface {
|
||
|
|
Start() error
|
||
|
|
Send(Event) error
|
||
|
|
}
|
||
|
|
|
||
|
|
// ChanLoop is implementation of EventLoop based on channels.
|
||
|
|
type ChanLoop struct {
|
||
|
|
events chan Event
|
||
|
|
once sync.Once
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewChanLoop returns ChanLoop with internal channel buffer set to q.
|
||
|
|
func NewChanLoop(q int) EventLoop {
|
||
|
|
return &ChanLoop{
|
||
|
|
events: make(chan Event, q),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Start starting to read events from channel in separate goroutines.
|
||
|
|
// All calls after first is no-op.
|
||
|
|
func (el *ChanLoop) Start() error {
|
||
|
|
go el.once.Do(func() {
|
||
|
|
// allocate whole OS thread, so nothing can get scheduled over eventloop
|
||
|
|
runtime.LockOSThread()
|
||
|
|
for ev := range el.events {
|
||
|
|
ev.Handle()
|
||
|
|
}
|
||
|
|
})
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Send sends event to channel. Will block if buffer is full.
|
||
|
|
func (el *ChanLoop) Send(ev Event) error {
|
||
|
|
el.events <- ev
|
||
|
|
return nil
|
||
|
|
}
|